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Here is a step-by-step guide for implementing the file upload functionality in the angular web applications. It will have the following code:

Let’s start building an application to understand the basic building blocks of the file upload functionality in the angular library. The second part is the angular controller used by the application to get access to the files. Continue reading

The angular framework provides the services and is used to do the HTTP request to retrieve the desired data from the server. In angular ajax, developers can send the Ajax requests in multiple ways, such as:

is the core angular service used to do the HTTP requests to communicate with the remote servers and retrieve the required data through the browser’s object or the . To access the angular ajax in a controller, developers will have to use the object i.e. service retrieve the data from the server in the following way. Continue reading

So I need to figure out what HTML will be produced by the following statement:return e( 'button', {onClick: () = this.setState({liked: true})}, 'Like');Well, since it’s a call to the createElement function I can explore the function’s implementation. Indeed, I see the call to the createElement inside:export function props, children) { const validType = isValidElementType(type); …

const element = createElement.apply(this, arguments);At this point I can either continue exploring the sources relying on WebStorm’s ability to figure out the location of the referenced createElement function or go back to debugging. I just need to match the parameters in the function’s signature and the function’s call:// signaturefunction createElement(type, config, children) { … }// actual callreturn e( 'button', {onClick: () = this.setState({liked: true})}, 'Like');Now I’m using my knowledge of how a browser DOM works to come up with a template. Continue reading

At first sight, these are the problems that we need to solve, in order to achieve our goal:Problem 1: I want to be able to instantiate all my brick components, and make them work, without ending up in a super-fat root component that does everythingIn order to solve this problem, we need to group somehow brick components inside different “areas” of the page; each area should receive a different set of data as input, instantiate its own set of brick components, make them work, and send signals to other areas (or to the root component) in response to user interaction. Problem 2: I want to be able to set up easily OnPush change detection strategyThe problem with “brick” components, i.e. reusable components that don’t decide anything about their internal status, is that it’s tricky to implement OnPush change detection on them, without in the same time binding them to the specific implementation of the parent component (hence, losing in reusability). The two components in the gist above behave very similarly, but they receive their inputs in a different way: the first component receives a bare number, while the second receives an object, that has a number among its properties. Continue reading

Now, whenever we create a React project, it automatically creates a lot of files and folders. So, in this article, I am going to explain what these files and folders are.When we create a React project, our application's structure looks like this. We only had React, React DOM and React scripts but React scripts have a lot of other dependencies which are present inside this folder. Continue reading

Hello readers, in this basic example, developers will learn what AngularJS is and how to use the angular filters in the angular applications. Following is the basic syntax using the angular filter in an angular application. Following is the syntax of using the currency filter in angular applications. Continue reading

This article aims to provide you some insight into JavaScript by comparing React and Angular 2; two of the most popular JavaScript frameworks today (you can read past comparisons between React and Angular 1; and React and Angular performance comparison). Add some style and provide the adapted index.html file (again, just copy-paste the one found on the Angular guide), and you can run it in the first terminal where you find:

At this point, we already used some TypeScript (and compared to Vanila JS, it provides a better code organization, typing, and annotations; but this is another thing to learn when you get into Angular 2). Angular 2 is, of course, an efficient framework — but my personal preference goes with React for clarity. Continue reading

Why JestSensible faster; parallelized test runsSnapshot testing; to make sure your UI does not change unexpectedlyRich CLI options; only run failed tests, filter on filename and/or test name, only run related tests since the latest commitReadable and useful tests reportsSandboxed tests; which means automatic global state resetsBuilt in code coveragePersonally I also like that I don’t need a browser in order to run my tests

What is JestZero configuration testing platformJest is a test framework created by FacebookThe number one test framework in React applicationsA testing framework for big and small teams

Creating an Angular applicationThe first thing to do is to create an application. Just like before we’ll delete the karma.config.js and test.ts files and we’ll also edit the test inside the generated spec file to look like this:test(’it creates my component’, () = { this change we can test our library with the same script as our application, which is npm test. Well… not exactly, when we run our tests we get the following errorthe application tests are failing because there exists several different files, or packages with the name my-awesome-libSplitting up JestLet’s take a couple of steps back, and ask ourselves if we want to test our library and our application at the same time? Continue reading

Let’s just quickly look at our input field, then we’ll explain what is going on:input type="text" v-model="todo"/V-Model ties the input of this field to a key we have in our data object called toDoItem. We essentially have to do three things here:Firstly, on the element we want to call the function: class=”ToDoItem-Delete” we have to create an emit function as a method inside the child component (in this case, ToDoItem.vue), which looks like this:deleteItem(todo) { this. $emit('delete', todo)}Along with this, you’ll notice that we actually reference a function when we add ToDoItem.vue inside of ToDo.vue:ToDoItem v-for="todo in list" :todo="todo" @delete="onDeleteItem" // — this 🙂 :key="todo.id" /This is what is known as a custom event-listener. Continue reading

While you might get away with not writing unit tests for very simple Rest API endpoints, doing the same for celery tasks is recipe for frustration (and disaster). Celery tasks are asynchronous by design and therefore a lot harder to get a grip on using a “development driven development” approach. Some authors recommend calling the Celery task asynchronously and then making the code wait until the task is ready to fetch the result and evaluate the test assertions. Continue reading

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